5uc9

From Proteopedia

Crystal structure of human Heme Oxygenase-2 in complex with Myristate

PDB ID 5uc9

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Structural highlights

5uc9 is a 4 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 1.903Å
Ligands:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

HMOX2_HUMAN Heme oxygenase cleaves the heme ring at the alpha methene bridge to form biliverdin. Biliverdin is subsequently converted to bilirubin by biliverdin reductase. Under physiological conditions, the activity of heme oxygenase is highest in the spleen, where senescent erythrocytes are sequestrated and destroyed. Heme oxygenase 2 could be implicated in the production of carbon monoxide in brain where it could act as a neurotransmitter.

Publication Abstract from PubMed

N-myristoylation is the covalent attachment of myristic acid to the N terminus of proteins in eukaryotic cells. The matrix domain (MA) of HIV-1 Gag protein is N-myristoylated and plays an important role in virus budding. In screening for host factors that interact with HIV-1 MA, we found that heme oxygenase (HO-2) specifically binds the myristate moiety of Gag. HO-2 was also found to bind TRAM, an adaptor protein for Toll-like receptor 4 (TLR4), and thereby impact both virus replication and cellular inflammatory responses. A crystal structure revealed that HO-2 binds myristate via a hydrophobic channel adjacent to the heme-binding pocket. Inhibiting HO-2 expression, or blocking myristate binding with a heme analog, led to marked increases in virus production. HO-2 deficiency caused hyperresponsive TRAM-dependent TLR4 signaling and hypersensitivity to the TLR4 ligand lipopolysaccharide. Thus, HO-2 is a cellular myristate-binding protein that negatively regulates both virus replication and host inflammatory responses.

Heme Oxygenase 2 Binds Myristate to Regulate Retrovirus Assembly and TLR4 Signaling.,Zhu Y, Luo S, Sabo Y, Wang C, Tong L, Goff SP Cell Host Microbe. 2017 Feb 8;21(2):220-230. doi: 10.1016/j.chom.2017.01.002., Epub 2017 Jan 26. PMID:28132836^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Zhu Y, Luo S, Sabo Y, Wang C, Tong L, Goff SP. Heme Oxygenase 2 Binds Myristate to Regulate Retrovirus Assembly and TLR4 Signaling. Cell Host Microbe. 2017 Feb 8;21(2):220-230. doi: 10.1016/j.chom.2017.01.002., Epub 2017 Jan 26. PMID:28132836 doi:http://dx.doi.org/10.1016/j.chom.2017.01.002